(7) Iris
ephemeris date magn radius delta ra dec elong phase
Today27 Sep 202210.82.701 AU3.698 AU11h57m-04°02'4.7°1.7°
Opposition30 Apr 20239.62.931 AU1.926 AU14h22m-19°51'174.6°1.9°
(7) Iris - 2022-09-27
astro.vanbuitenen.nl


 
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The interactive orbit chart above shows the body's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below. (Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)

The orbital elements of Iris are:

            e (Eccentricity)                : 0.2294992
            a (Semimajor axis)              : 2.3866161
            i (Inclination)                 : 5.51768
            Ω (Longitude of ascending node) : 259.52553
            ω (Argument of perihelion)      : 145.34353
            M (Mean anomaly)                : 47.64234
            Epoch                           : 2022 Jan 21

            L (Longitude of perihelion)     : 224.99343
            B (Latitude of perihelion)      : 3.13437
            P (Orbital period in years)     : 3.69            
        

The light curve chart below shows the estimated development of the minor planet's magnitude.


The all-sky chart below shows the path of the minor planet over the same period as the light curve. The current position is marked yellow.





The following chart shows the path of the minor planet in the next few days. The field of view is optimized for (~10x50) binoculars and finderscopes. A more printer-friendly version of the same chart can be found below.




Ephemerides:
Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2022-09-27 00:00 UT   11 57 31.1   -04 02 44     3.698    2.701    4.7    1.7   236   10.8 
2022-09-27 02:21 UT   11 57 40.0   -04 03 42     3.699    2.701    4.7    1.8   237   10.8 
2022-09-28 00:00 UT   11 59 02.3   -04 12 34     3.699    2.702    5.0    1.9   242   10.8 
2022-09-29 00:00 UT   12 00 33.5   -04 22 24     3.700    2.704    5.4    2.0   246   10.8 
2022-09-30 00:00 UT   12 02 04.6   -04 32 13     3.701    2.706    5.8    2.1   250   10.9 
2022-10-01 00:00 UT   12 03 35.6   -04 42 02     3.701    2.708    6.2    2.3   254   10.9 
2022-10-02 00:00 UT   12 05 06.4   -04 51 51     3.702    2.710    6.7    2.5   257   10.9 
2022-10-03 00:00 UT   12 06 37.2   -05 01 39     3.702    2.712    7.1    2.6   260   10.9 
2022-10-04 00:00 UT   12 08 07.9   -05 11 26     3.702    2.713    7.6    2.8   262   10.9 
2022-10-05 00:00 UT   12 09 38.6   -05 21 13     3.702    2.715    8.1    3.0   264   10.9 
2022-10-06 00:00 UT   12 11 09.1   -05 30 59     3.701    2.717    8.6    3.2   266   10.9 
2022-10-07 00:00 UT   12 12 39.5   -05 40 45     3.701    2.719    9.1    3.3   268   11.0 
2022-10-08 00:00 UT   12 14 09.8   -05 50 30     3.701    2.721    9.7    3.5   269   11.0 
2022-10-09 00:00 UT   12 15 40.0   -06 00 14     3.700    2.722   10.2    3.7   271   11.0 
2022-10-10 00:00 UT   12 17 10.2   -06 09 58     3.699    2.724   10.7    3.9   272   11.0 
2022-10-11 00:00 UT   12 18 40.2   -06 19 41     3.698    2.726   11.3    4.1   273   11.0 
2022-10-12 00:00 UT   12 20 10.1   -06 29 23     3.697    2.728   11.8    4.3   274   11.0 
2022-10-13 00:00 UT   12 21 40.0   -06 39 04     3.696    2.729   12.4    4.5   275   11.0 
2022-10-14 00:00 UT   12 23 09.7   -06 48 44     3.694    2.731   12.9    4.7   276   11.0 
2022-10-15 00:00 UT   12 24 39.4   -06 58 24     3.693    2.733   13.5    4.9   277   11.0 
2022-10-16 00:00 UT   12 26 08.9   -07 08 02     3.691    2.735   14.0    5.1   277   11.1 
2022-10-17 00:00 UT   12 27 38.3   -07 17 40     3.689    2.736   14.6    5.3   278   11.1 


    Terminology:
            
    delta:  distance between minor planet and earth in AU
    radius: distance between minor planet and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-minor planet)    
    phase:  phase angle in degrees (angle sun-minor planet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km
    

Orbital elements provided by the MPC (Minor Planet Center).
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.